Abstract
We present results from the first phase of the KamLAND-Zen double-beta decay experiment, corresponding to an exposure of 89.5 kg yr of . We obtain a lower limit for the neutrinoless double-beta decay half-life of at 90% C.L. The combined results from KamLAND-Zen and EXO-200 give at 90% C.L., which corresponds to a Majorana neutrino mass limit of based on a representative range of available matrix element calculations. Using those calculations, this result excludes the Majorana neutrino mass range expected from the neutrinoless double-beta decay detection claim in , reported by a part of the Heidelberg-Moscow Collaboration, at more than 97.5% C.L.
- Received 16 November 2012
DOI:https://doi.org/10.1103/PhysRevLett.110.062502
© 2013 American Physical Society